Gap junctions in plant cells can close
a. true
b. false
Answer: a. true
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Most fungi obtain nutrients from dead plants and animals. These fungi are called ________.
A. free-living B. parasites C. saprobes D. antagonists E. mutualistic
A graph of phenotypic variation similar to the accompanying illustration strongly suggests
a. incomplete dominance. b. codominance. c. epistasis. d. polygenic inheritance. e. environmental effects on phenotype.
The vast majority of energy stored in the body is found in:
What will be an ideal response?
Membrane-bound organelles have been an important component in the evolution of complex, multicellular organisms. Which of the following best summarizes an advantage of eukaryotic cells having internal membranes?
(A) Eukaryotic cells are able to reproduce faster because of the presence of organelles. (B) Some organelles, such as mitochondria and chloroplasts, are similar to prokaryotic cells in structure. (C) Organelles isolate specific reactions, increasing metabolic efficiency. (D) Compartmentalization leads to a higher mutation rate in DNA, which leads to more new species.